Enhanced strength and plasticity of a Ti-based metallic glass at cryogenic temperatures

Huang, Yongjiang; Shen, Jun; Sun, Jianfei; Zhang, Zhefeng

doi:10.1016/j.msea.2008.08.010

Cited by 70 publications

(39 citation statements)

References 38 publications

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“…We also noticed the inconsistency between the reported enhanced compressive plasticity [1][2][3][4][5][6][7][8] and the reduced bending plasticity presented here in a certain range of cryogenic temperature. The enhanced compressive plasticity is generally believed to result from an intrinsic shear-band nucleation rate that increases with decreasing temperature [1,5,7].…”

Section: Discussioncontrasting

confidence: 74%

“…The enhanced compressive plasticity is generally believed to result from an intrinsic shear-band nucleation rate that increases with decreasing temperature [1,5,7]. However, very recently, Loeffler groups [15,19,44] had suggested that the shearband propagation velocity obeyed an Arrhenius relation with temperature.…”

Section: Discussionmentioning

confidence: 99%

“…Similar to crystalline alloys, BMGs usually exhibit higher strength with the decrease of the ambient temperature [1][2][3][4][5][6][7][8][9][10]. Its underlying mechanism has been discussed in terms of shear transformation zones (STZs) [1,3,5,[10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, the strengthened materials at low temperature usually behave more brittle. However, very interestingly, it is reported that BMGs at cryogenic temperature show enhanced plasticity in compression [1][2][3][4][5][6][7][8], even in tension [9,10]. Such plasticity improvement was attributed to multiple-nucleation of shear bands at low temperature [1,5,7].…”

Section: Introductionmentioning

confidence: 99%

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Ambient temperature embrittlement of a Zr-based bulk metallic glass

Jiang¹,

Wang²,

Jiang³

et al. 2012

Materials Science and Engineering: A

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a b s t r a c tThree-point bending experiments were performed on Zr 52.5 Cu 17.9 Ni 14.6 Al 10 Ti 5 (Vit105) bulk metallic glass (BMGs) over a wide range of ambient temperatures varying from the liquid nitrogen temperature (77 K) to about boiling water temperature (370 K). The results demonstrated that the flexural strength of the Zrbased BMG monotonously increased with decreasing of test temperature, whereas plastic deformation ability displayed a maximum at a moderate temperature (about room temperature). That is, the plastic deformation ability was deteriorated by either higher or lower temperature than room temperature through affecting shear band nucleation and propagation within materials respectively.

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Section: Discussioncontrasting

confidence: 74%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ambient temperature embrittlement of a Zr-based bulk metallic glass

Jiang¹,

Wang²,

Jiang³

et al. 2012

Materials Science and Engineering: A

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“…[17][18][19] It was found that the compressive maximum strength and plastic strain prior to failure are higher at cryogenic temperatures than at ambient temperature. Recently, Huang et al 20) reported similar results in compression tests for a Ti 40 Zr 25 Ni 3 Cu 12 Be 20 BGA. However, no data are available on mechanical behavior under tensile loading for BGAs at cryogenic temperatures.…”

Section: Introductionmentioning

confidence: 60%

Enhanced Tensile Strength and Plasticity of Zr-Cu-Al Bulk Glassy Alloys at Cryogenic Temperatures

et al. 2009

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No data are available about mechanical behavior of bulk glassy alloys (BGAs) in tension at cryogenic temperatures. In this study, we investigated the effect of temperature on the mechanical behavior of ternary eutectic and hypoeutectic Zr-Cu-Al BGAs fabricated by an arc tilt casting method. Tensile tests were performed for the BGA plates with gauge dimensions of 5 mm in length, 1.2 mm in width and 0.5 mm in thickness at temperatures of 295, 223, 173 and 77 K, at an initial strain rate of 5 Â 10 À4 s À1 . Measurements of elastic parameters were also made at temperatures from 97 to 342 K by an ultrasonic pulse method. It is found that the tensile strength and elongation for both BGAs increase with decreasing testing temperature, which is reported for the first time under a tensile condition. At cryogenic temperatures, the tensile elongation of the hypoeutectic Zr 59 Cu 31 Al 10 BGA tends to be higher than that of the eutectic Zr 50 Cu 40 Al 10 BGA, although the difference is small. Multiple shear bands are observed on the side surface deformed at lower temperatures. The Young's and shear moduli, and Debye temperature monotonically increase with decreasing temperature. This indicates that the BGA becomes rigid and the effective atomic distance decreases at cryogenic temperatures, leading to the increase of the tensile strength at cryogenic temperatures.

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Transition of Failure Mode and Enhanced Plastic Deformation of Metallic Glass by Multiaxial Confinement

Zhang

Mao

2009

Adv Eng Mater

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Metallic glasses possess unique properties, such as high strength and high hardness; thus, much attention has been paid to the development of new alloy systems with good mechanical properties. [1][2][3][4] Meanwhile, the mechanical properties of the numerous metallic glasses available have been investigated from different aspects. With the development of the focus-ion-beam (FIB) technique, the size effect on the mechanical properties of metallic glasses on the micrometer scale has also been determined. [5][6][7][8][9][10] These studies found that there is little size effect on the strength, but great effect on the plastic-deformation ability of metallic glasses. [5][6][7][8] Moreover, multiple shear bands were found to be operating in the samples and the plastic strain was in the form of a shear-band burst. [5][6][7][8] In addition, the effect of the geometry on the mechanical response in metallic glasses has also been studied. For example, Lewandowski et al. [11] and Lu et al. [12] investigated the effect of pressure on the yielding and fracture of metallic glasses under tension or compression. In contrast to the catastrophic shear failure in uniaxial compression, the metallic glasses exhibited a large plastic deformation of more than 10% under confinement. [12] In addition, rolling has been applied, to induce profuse shear bands and large deformation and study the evolution of the free volume, [13][14][15] and also to reveal the effect of pre-existing shear bands on the mechanical properties of metallic glasses. [16] Meanwhile, it has been found that the residual stress on the surface of metallic glasses is also useful for improving their mechanical properties. [17] Recently, the mechanical properties of metallic glasses under biaxial tensile loading were studied by the small punch test (SPT). [18][19][20] It was interesting to find that the metallic glasses could be controlled to create regularly arrayed, fine, multiple shear bands under the SPT, indicating that metallic glasses essentially have a good plastic-deformation capability and thus high ductility under suitable loading conditions. The findings showed that the initiation and propagation of shear bands in metallic glasses strongly depend on the stress state. However, under the SPT, some metallic glasses show a faint shear-deformation capability, such as Ti-based metallic glass, which exhibits a significantly unstable shear deformation and a different failure mode to that of Zr-based metallic glass. [20] Therefore, in this communication, the shear-deformation behavior of a Ti-based metallic glass under multiaxial confinement is evaluated and analyzed using the SPT. We confirm that under multiaxial confinement, the sheardeformation capability of a metallic glass can be greatly improved, and that the failure modes can also be changed under this confinement. Figure 1 shows the load-deflection curves of samples S1 and S2, subjected to the SPT. The maximum deflection of sample S1 was 0.63 mm, and the initial stiffness was 2.98 kN mm À1 . However, with confin...

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Enhanced strength and plasticity of a Ti-based metallic glass at cryogenic temperatures

Cited by 70 publications

References 38 publications

Ambient temperature embrittlement of a Zr-based bulk metallic glass

Ambient temperature embrittlement of a Zr-based bulk metallic glass

Enhanced Tensile Strength and Plasticity of Zr-Cu-Al Bulk Glassy Alloys at Cryogenic Temperatures

Transition of Failure Mode and Enhanced Plastic Deformation of Metallic Glass by Multiaxial Confinement

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